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LibUA

Open-source OPC UA client and server library for .NET Framework and .NET Core based on IEC 62541. Available a library, a demo client and a demo server. Tested and commercially used in industrial applications with commercial vendors' UA servers and clients.

Available as a nuget package for .NET Core (1.0.31): https://www.nuget.org/packages/nauful-LibUA-core

Features

  • Fully supported OPC UA core client and OPC UA server specification.
  • OPC UA binary protocol with chunking.
  • Security profiles None, Basic128Rsa15, Basic256, Basic256Sha256, Aes128Sha256RsaOaep (.NET Standard only) and Aes256Sha256RsaPss (.NET Standard only).
  • Optimized memory buffers for encoding/decoding large and complex structures to/from raw bytes.
  • Support for all message types, node types, and default address space from the UA specification.
  • Support for signing and encrypted security profiles.
  • Anonymous, user/pass and certificate-based authentication.
  • Sessions, subscriptions (data change notifications and custom notifications), custom events and alarming.
  • Extendable server address space with hooks for client requests for access control, read handlers, write handlers, etc.
  • Support for reads, writes, updates, historical data and aggregation.
  • Server instances have low overhead: tested with hundreds of clients performing simultaneous historical reads, data change notification subscriptions and real-time writes.

License

Standard Apache License 2.0.

  • Permissions: Free for commercial use, modification, distribution, patent use and private use.
  • Conditions: Credit must be given to this github repository/owner, license and copyright notice, state changes.
  • Limitations: No trademark use, no liability, no warranty.

Errata

The demo client and server applications can create self-signed certificates with sufficient fields for most usage. Remember to move these to the trusted directory on a server when connecting to a server for the first time.